noun
isobaric surface; constant-pressure surface
Technical term in meteorology and fluid dynamics for a surface where atmospheric pressure is equal at every point.
天気図では、等圧面の高度分布が重要な情報となる。
On weather maps, the height distribution of isobaric surfaces provides important information.
Compound of 等 (equal) + 圧 (pressure) + 面 (surface). A straightforward technical coinage.